An insider told Us Weekly the guys enjoyed a private cabana and soaked up the Las Vegas at Azure Pool at the Palazzo on Saturday. Later that day, Osbourne tweeted, "This. Is. Awesome! Heading to Lagasses Stadium at Palazzo Las Vegas to watch the UFC fights. Bachelor party."

While Osbourne was enjoying his bachelor party, Stelly was having fun at her bachelorette party. The bride-to-be tweeted to her husband-to-be on Sept. 23, "My bachelorette party is better than your bachelor party."